Chuck.



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rnnnnnon LACKNER, or rrrrse'oeeir, PENNSYLVANIA.

T of all whom it mayconcem :1"

Be itlrnown thaftl, FREDERrCK LACKNER,

` ahresident of Pittsburgh,` in the county of l-4Allegheny. end State of"Pennsylvania,

`have"invented a ,new and useful Improvespeccation.

` -1l,`hisi invention relates toftool chucks or 'holdersp` andparticularly. to chucks for holdinofjand'*rotating taps and `othersimi-4 Wlartods. 1 1 y x y l The `object of the invention is to provideaftool chuckgwhich automatically releases theftooltherefrom afterajgiven number of ,operations `and which chuck is automati- 1' cally yoperated `by the Work itself; "thereby requiring no special attention onthe `part "of",thewoperaton preventing the` liability of injury inreleasing the tool `from the holderyand insuring stopping,` of thetaplpingllor,boring,operationgwhen the tooll is llid `and 'thuspreventinglinjury 4to 'the 11300 I- HA `.further object of `theinvention is to` 25` `provide an improvedl chuck nrtoolfholder oflfftheclass `described whichl `is of simple clonstruetion," Whieh ispositivelyoperated,

ivhioh does not depend upon the pressure of springs,` which -requireslnohand mampulw gtionxother than 'that 'ofiinserting the tool finto" theholder, and which holderkoan be `readily changed so esto operate intheusual frnanner4 of vsuch tool holders,A Without the automatic feature,`Wheneverl desined,` y

The invention comprises the tool holder "hereinafter described kandclaimed;

Inxqthej drawingd'; which represent one e embodiment of the invention,Figure l is aseotwnal elevation` showing .a tap` 1n the postion in Whichitis rotated and heldby w theehuc/k; .2e-is asimilar view showing the.tapbeingr` released fromthe chuck; Fig.

,a cross section on Athe Aline `3--2-5,ligt

- and Fig.. 4 is a side elevation of the de ineiitfin Chucks, of whichthe ollovving'is- Specification of Letters Patent.l i figbgmtgd 151m?,14g, 191:5', appncanen inea Julyee, 1914. serial no. essere. I

4the lower end of a chuck holder 3,`Which has the usual tapered shank fiprovided with a suitable tang at its upper end and which shank isadapted to be inserted Vinto a corresponding' tapered socket in thedrill press spindle.` as will be readilyunderstood. The lower portion ofthe bore of the b ody member l. is shovvn as Smaller than its upperportion, part of the reduced bore,` indicated at 5, being cylindricaland. part non-circular, that is, of square or other cross section, asindicated at 6, to

receive the similarly shapedftang-end 7 of the tool 8 for rotating thesaine. Said tool is shown as a tap-to be used for threading nut-s,although it is to be understood that any suitable drill, tap or othertool .may be lused with the chuck, as de sired.l e 4 W. The lower `endof the body 'member l 1s enlarged to form a head 9, which may belattened on two or more sides, asshorvn at l0, ifdesired. Said headforms e shoulder 1l to receive und support the inner portion oftheflangeoif a sleeve '12,-yvhiehfis slidably and` rotatably't mountedupon the outside of the body member 1 and which serves to'operate thetool chuck, as will more `fully hereinafter appear. The head 9 isprovided `With one or av plurality, .two being shown', o''radiallyextending'` openings4 18, in which are located .tool holding lpins orabutments 14, shown as provided with Shanks the inner ends of whch pro`ject int'othe bore 5 of the body rnernber,` and having enlarged heads l5'on their outer ends Working in sockets inthe head of' the` body,member,` and which headsex tend 'slightly beyond the peripheral surfaceof the head of the body member. The inner. ends of the pins le, whenseid pine occupy the position shown in Fig. l, e'lm tend4 into anannulary groove 1G in the shank of the tool S. the shoulder at the upAlper end of said groove preventing` the tool frorndropping; out of thechuck.

'llhe'inner surface of the rim orwell of the sleeve l2 is tapered anddares downwardly and outwardly, as shown, in Fig. l. Said sleeve isthreadedat its lower end Where it is provided with a cap 17 having acentral here through which the tool projects, the A 'peripheral surfaceofsaid cap and of the `lange et the upper end of the sleeve 12 b e-`ingl preferably knurled or roughened teven-- able the cap to be readilyattached to or removed from the sleeve Whenever desired.

At'ione side of the lchuck the upper face of the iiange of the sleeve 12is hollowed. out to provide a depression 18 for vcoperation with asuitable abutment or stop 19 threaded. into or otherwise secured to theouter sur face oit' the body member 1, andwhich abutfl ment alsocoperates with a pin or projection 20 projecting upvvardly from thesleeve 12, for a. purpose which will more fully-hereinaiiter appear.Preferably, also, a loose disk or block 2l is placed in the'bottom ofthe larger portion of the' bore of theA body member 1, to receive theimpact of the tool 8 When inserted into the' chuck and prevent the samevfrom damaging the lower end of 'the spindle 4;.

In use of the tool holder the body member 1 is attached lto the spindleof the drill press or other machine,` or is ifastenedxrto the taperedspindle 4L. which is inserted in the drill spindle of the machine, inthe usual manner. The tool, such as ythe tap 8, is then inserted in thechuck rom'beneath and is forced upwardly lto the position shown in Fig.1, the sleeve 12 being held in its upper position., shown in Fig. 2,While.` the tool is inserted. 'When lthe tool reaches itsv seat thesleeve 12 is allowed to drop by gravity 'untillit rests onl the shoulder11' of the body member 1, the inner beveled surface` of its rim or Wallacting as a cam or Wedge to force lthe pins 14 inwardly to the positionshown ished the nut reaches the upper or blank por-- tion. of the shankof the tool, the machine spindle is retracted, another 'nut is fed intoi the operating position and a second tapping operation proceeds asbefore. The tap .is usually provided with a shankl having a blankportion longenough .to hold a number oi. nuts, say ten or twelve. Thesenuts pile up successivelyv upon the shank until.

the blank portion of the shank is Itull, Whereupon, at the'conclusionoithe next tapping operation, the uppermost nut reaches the cap 17 andlifts said cap and the sleeve 12 from lthe shoulder 11. The Weight ofthe tap and `the nuts carried therebyis thensuiiicient to force the pins14 radially outwardly, it being understood that'the shoulder at the ups.

per end of the annular groove 16 is slightly beveled and therefore'actsas a cam or Wedge against the ends of said pins. The tap and nutscarriedthereby consequently drop out of theholder and theattendant. removes'the-springs to Wear out nuts and .replacesl the ta andthe tappingoperations proceedas be ore'.

When the device ,is operating automatiea1ly,in the mannerjjustdescribed, the abutment`19 located directly 'over the depression lf3-inthe sleeve V12 and permits said sleeve to rise to free thetool from thechuck.

If it is desired to -use the chuck in th'eordi nary manner, and Withoutthe automatic feature', the sleeve 12 is rotated upon the bodymem'be'r luntilr the abutment 19 strikes the pin @0,1m which position saidabutment is at one side of and cannot enter the depression 18.Consequently, the sleeve 12 cannot be lii'tedl and the tool cannot beVreleased from the chuck.

The chuck described is simple and is positive in operation. It requiresno manual adtherefore does not injure the `halide of Vthe operator,Moreover, it does not require close attention, as the operator knowsthat the tool will be released from the chuck when filled with articlesbeing operated upon and consequently 'does' not have to be present tostop the 4machine Whenthe tool is full. There are no projecting artsliable to catch 4inl the clothing of wor :men and fno or break.-Moreover, the device can be readily adapted for either automatic ormanual operation by, a simple rturn of the operating sleeve.

What I claim is;- b 1.- A toolchuck, comprising a body memer ceiving -atool, and movable tool holding pins, an abutment on said body member,and a sleeve resting on said shoulder and arrangedto engage said pinsand force the same into engagement with saidk toolysaid sleeve beingslidable upon said body member and provided with. a depression to'receive .said abutment, and said sleeve and abutment being relativelymovable i around the axis of the sleeve to a position in which therelease of the Atool is prevented.

2. A tool chuck, comprising a body mem' ber, movable tool holdingdevices thereon, a movable memberarranged in. one position to hold saiddevices inV engagement With the tool and in another position to releasesaid devices from the tool,v said movable'member provided Vwith ashoulder, a bore. for 'ref Justinentto release the tap from the tool andi being so arranged asto be operated' by the articles being operatedupon for moving it to tool releasing position, ,and means carried -bysaid body member for locking said movable member in tool holdingposition.v

3. A tool chuck, comprising a body 1nember provided With movable meansarranged in one position to engage and support a tool,

.and a sleeve slidable upon said bony member and arranged in oneposition to hold said movable` means in' engagement with theteol, saidsleeve being yarranged to be .moved by the articles beingy operated4upon .to release r l l l n Vbeing provided with adepressiomend an ameno?the tool from the ehuolgand means carried y said bodymember for lockingsaid sleeve in tool holding positioni 14, A tool chucks comprising abody member provided with a shoulder, a tool receiving bore, and movabletool holding pins, a deeve rotatable and longitudinally slidable uponSaid body `member and arranged when'V seated against said shoulder tohold said pine in engagement with the tool, said sleeve abutment on thebody member arranged to enter said depressionwnen opposite the same andpermit the sleeve to move longitudinally 'to release the tool and alsoarranged when saidsleeve is rotatedto a` position Where Said abutmentand depression areout of registration to look the sleeve and pine inool'liold ing position and prevent` release of said tool. i 5. A toolchuck, comprising a body memloer` provided Wiliia shoulder, atool'reoeiving bore, andlniovable tool holding pins, a

release 'olie tool and also arranged when said sleeve is rotated to aposition Where said abutment anddepression are out of regievtration tolook the sleeve and pins in tool holdingposition and prevent release ofsaid tool, and a projection on said sleeve arranged to engage saidabutment when said sleeve is rotated to Said position.

in teetin'xony whereof, have hereunto sel'J my hand.

FRllDllK LACKNER. lilitneseee:

Josemi- Dnemm'na, Jr., R, EL LACKNER.

